diff --git a/gwsumm/plot/utils.py b/gwsumm/plot/utils.py
index af20b280..af063d53 100644
--- a/gwsumm/plot/utils.py
+++ b/gwsumm/plot/utils.py
@@ -34,6 +34,7 @@
 
 LINE_PARAMS = [
     'linewidth', 'linestyle', 'color', 'label', 'alpha', 'rasterized',
+    'zorder',
 ]
 COLLECTION_PARAMS = [
     'cmap', 'vmin', 'vmax', 'marker', 's', 'norm', 'rasterized',